Light Waves Chapter Two

These graphs show the wavelength and amplitude of light coming from three lasers. Could any of these lasers be giving off a different type of light?

• Yes. Laser 2 could be giving off a different type of light because Laser 2 has a different wavelength than Lasers 1 and 3.

• Yes. Laser 3 could be giving off a different type of light because Laser 3 has a different amplitude than Lasers 1 and 2.

• Yes. All three lasers must be giving off different types of light because every light source gives off its own type of light.

• No. All three lasers must be giving off the same type of light because all three are lasers, and the same kind of light source gives off the same type of light.

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Light ...

• can only be reflected

• only comes in one form

• carries energy from one place to another, even through empty space

• is a type of wave that carries energy from one place to another, even through empty space

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Aniyah has a special type of paper that can permanently change color. She wonders whether light can cause the paper’s color to change. The table below shows what happens when different types of light hit the paper. Based on this information, which type of light can cause the paper to change color?

• The infrared light can cause the paper to change color.

• The X-ray light can cause the paper to change color.

• The ultraviolet light can cause the paper to change color.

• Any of these types of light can cause the paper to change color, because all light carries energy that can cause materials to change.

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In order for light to change an object, that object must _______ the light and its __________.

• reflect, wavelength

• transmit, amplitude

• reflect, energy

• absorb, energy

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Ana wonders how light can affect a mystery material. The table below shows what happens when different types of light hit the mystery material. Based on this information, can light change the mystery material?

• Yes, but the mystery material can change in only one way, such as by getting warm, because all the light that a material absorbs will affect that material in the same way.

• Yes, and the mystery material can change in one or two different ways, such as by getting warm and/or changing color, because different types of light can cause different changes to a material when they are absorbed.

• No. The mystery material can’t change because light is not a physical thing. Light cannot change physical things like the mystery material.

• There is no way to know whether the mystery material will change or not.

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When a material absorbs energy from light the energy causes the material...

• to stay the same

• to transmit the light

• to reflect the light

• to change

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Different types of light can change a material ...

• in different ways

• in the same way

• only if it transmits the light

• only if it reflects the light

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Dentists use a soft, clay-like material to make a filling for a cavity. The filling stays soft under the light of the dentist’s lamp, but it hardens when the dentist shines an ultraviolet flashlight on it. Why does light from the ultraviolet flashlight harden the filling when light from the lamp does not?

• Because ultraviolet light carries energy, and light from the lamp does not.

• Because the filling material can take in energy from ultraviolet light, but not from the light from the lamp.

• Because ultraviolet light pulls energy out of the filling material, and light from the lamp does not.

• Because ultraviolet light carries hardening molecules, but light from the lamp does not.

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The two terms to describe a the properties light wave are

• Amplitude: How tall a wave is

• Transmit: to pass through

• Wavelength: How far apart the peaks are

• Absorb: To take in

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A light wave ...

• Can be reflected

• Can be absorbed

• Can be transmitted

• carries energy

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